I'm new to firearms. I got my first rifle - norico m305b - from master last thursday; and yesterday I finally got time to desassambly and degrease the gun. I followed some instructions from the forum (thank you so much guys) and also a m14s disassambly video on Youtube. Everything was fine until the last part of reassambly - I CAN'T PUSH THE TRIGGER GUARD BACK TO THE LOCK POSITION. In the Youtube video, the guy was able to push it back very easily; however, I couldn't manage to do it. I pushed the little rail into the notch with no problem, but that was it; the trigger guard cannot go down any further. The video I followed was this: http://www.youtube.com/watch?v=ZYqeyISsezo. Could you please help me out?
Also, my friend told me to never dry fire a firearm, but I might accidentally dry fired once while pushing this stupid trigger guard back to position. Is it a big deal? Should I do something to investigate the damage?

Thank you for your reading.
Also, my friend told me to never dry fire a firearm, but I might accidentally dry fired once while pushing this stupid trigger guard back to position. Is it a big deal? Should I do something to investigate the damage?

Thank you for your reading.